Spain and Portugal have been hit by a widespread power outage on Monday, leaving millions without electricity, according to reports.

In Portugal, official sources told domestic media that the outage was nationwide, while similar reports are coming out of Spain.

Madrid’s Barajas international airport was left without power, while telecommunications have been affected as well. Meanwhile, other airports have come to a standstill throughout the region.

Citizens of Andorra and parts of France bordering Spain were also reporting being hit by the blackout. Further outages have been reported as far as Belgium, according to the latest information.

The cause is yet unclear. Domestic media are reporting issues with the European electric grid, which affected national grids in the Iberian Peninsula, however. A fire in south-west France, on the Alaric mountain, damaging a very high voltage power line between Perpignan and eastern Narbonne, has also been named as a possible cause.

This is a developing story and our journalists are working on further updates.